Peculiarities in the high-pressure phase behaviour of binary mixtures of nitrogen with methane, helium and water

Abstract

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High-Pressure Compounds in Methane-Hydrogen Mixtures

“…X-ray data were collected on a single crystal grown from a starting colnposition of Compared to other binary systems such as Ar-H, (14) and He-Ne (15), in which only one compound has been observed, four solid phases have been documented here. Two of the stoicl~lometric solids observed fall close to the colnpounds observed 111 the Nz-CH4 system (16). However, in contrast to that system, no unmixing was observed in the fluid phase.…”

“…The Cu(1) salts with these counterons produce the peroxo complex upon low-temperature leactlon w t h 0, ~n CH,C12. 16. Snge crystals of 3.7(CH,),CO. 2CH,CN were grown by oxygenation and subsequent storage of a sout~on of [d,,-Lfi"Cu(CH,CN)]SbF, (conta~n~ng perdeuterated benzy groups to slow decompos~t~on) n 1 .…”

Phase equilibria in water containing binary systems from molecular based equations of state

“…Experimental [10,11,55,56] and theoretical [57,58] studies exist for this system over wide pressure and temperature ranges. The critical curve beginning in the vicinity of the water critical point has a minimum temperature at 639 K and 75 MPa [10] and evolves to high pressures (Type III behaviour) [16] with an almost linear trend [10,11].…”

“…The critical curve beginning in the vicinity of the water critical point has a minimum temperature at 639 K and 75 MPa [10] and evolves to high pressures (Type III behaviour) [16] with an almost linear trend [10,11]. The system water + nitrogen has the highest minimum temperature for the critical locus of the studied Type III water-containing binary systems [10].…”

“…It is also important in high-pressure and high-temperature regions for geochemical studies [9]. The water + nitrogen system is important for natural gas and oil processing, and it has wide use for testing theoretical models [4,10,11]. Phase behaviour of water + n-alkane systems is critical for reservoir production and drilling operations and for oil and gas reservoir engineering [12].…”